Russia has dismissed reports that hundreds of its citizens were killed in clashes with U.S.-led forces in Syria as “classic disinformation.”

U.S. airstrikes are reported to have killed the largest number of Russians since the end of the Cold War on Feb. 7 when they targeted up to 200 mercenaries attempting to take over an oil refinery.The death toll is estimated to be as low as 11 and up to 217 private military contractors from Russia.